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They're adding integration in with Docker too for Criu: http://criu.org/Docker

Here's a fun example of it in action: http://blog.kubernetes.io/2015/07/how-did-quake-demo-from-do...

Looks really nice except having to compile custom Kernels I guess.

but it is in user space, why the need for compile kernel?

Some distros (e.g Arch) don't have CONFIG_CHECKPOINT_RESTORE enabled by default.

Did it change the startup time significantly?

Yeah, it was much faster than starting up the normal way, at least for a small heap (213 ms to restore 128MB on an E5645). I didn't pursue it further because it required root (not sure if it still does) and would've required writing some kind of snapshot manager.